Thermogravimetric kinetics of crude glycerol

摘要: The pyrolysis of the crude glycerol from a biodiesel production plant was investigated by thermogravimetry coupled with Fourier transform infrared spectroscopy. main gaseous products are discussed, and thermogravimetric kinetics derived. There were four distinct phases in process glycerol. presence water methanol responsible for first decomposition phase, shown to catalyse (second phase). Unlike pure compound, below 500 K leaves behind large mass fraction residues (ca. 15%), which eventually partially eliminate two upon reaching significantly higher temperatures (700 970 K, respectively). An improved iterative Coats-Redfern method used evaluate non-isothermal kinetic parameters each phase. latter then utilised model behaviour conditions. power law (first order) predicted accurately (second) third Differences 10-30 kJ/mol activation energies between their phase corroborated catalytic effect pyrolysis. 3-D diffusion more reproduced fourth (last) whereas short initial poorly simulated despite correlation coefficients ca. 0.95-0.96. 3rd 4th phases, attributed fatty acid methyl esters cracking tarry residues, sensitive heating rate.